Determine the level of threat: 

Someone who has very little intent to cause you verbal or physical harm

Someone who has intent to cause you physical harm (1 on 1 scenario)

Someone who intends on causing you grievous physical harm or death (can involve more than 1 person and will probably include some type of weapon)

Identifying the level of threat will help you  determine what your response should be. You will only have seconds sometimes to make these decisions, so making the right one is very important